The Las Vegas-area wildfire that has affected air quality in Clark County prompted the closure Thursday of hiking trails in Red Rock Canyon, a national conservation area.
The Carpenter 1 fire spread Thursday into a remote part of Red Rock Canyon. The area's scenic loop was closed to motorists for part of Thursday morning, but the loop has since reopened.
The visitor center is operating as usual.
The fire's spread had slowed somewhat by Thursday; about 28,000 acres in the region commonly called Mt. Charleston have been scorched, an increase of about 3,000 acres from Wednesday. At least six structures have burned.
More than 1,200 firefighters are working to contain the blaze, but complete containment is not expected until July 19. The fire is the result of a July 1 lightning strike.